Narrowing searches based on url, author, date, and other attributes is also possible. For instance, the query [ Streisand sourcename:Techdirt ] restricts searches for "Streisand" to items from the blog "Techdirt".
Examples of other operators follow:

sourceurl:http://www.theverge.com/

items from the blog http://www.theverge.com/

sourcename:"New York"

items from blogs with "New York" in the name

date:10/20/11

items that appeared on 10/20/11

date:[10/1/11 TO 10/20/11]

items appearing between 10/1/11 and 10/20/11

author:"Bill Gates"

items by author "Bill Gates"

title:unsubstantiated

items with "unsubstantiated" in the title

body:"severely polluted"

items with "severely polluted" in the body

link:http://www.marco.org/2011/04/16/rumored-apple-hdtv

items linking to http://www.marco.org/2011/04/16/rumored-apple-hdtv

Note: all operators that take urls will accept simple domain names, which match any item at that domain, or complete item urls.

TiVo Roamio Pro review: this is the ultimate cable box
— But it comes at a price — There is nothing more instantly dangerous to the average relationship than screwing up the TV. — It's just a fact, crystallized in 50 years of jokes about remote controls: who's holding it, how complicated it is, how many there are.

Yes, Gmail users have an expectation of privacy
— Sending email to Gmail users means you expect Google's servers will process it — Consumer groups are up in arms today over a motion Google made in June to dismiss a class-action lawsuit alleging that Gmail violates federal …

Moto X will not be a Droid on Verizon
— The new flagship stands alone, but the Droid lives on — Motorola's forthcoming Moto X phone will not be a Droid device on Verizon, multiple sources tell The Verge. The change marks a sharp inflection point in the tight relationship between the two companies …

Does anyone know why Google bought Motorola?
— The products weren't great and the patents overvalued — so what did that $12.5 billion actually buy? — Why did Google spend $12.5 billion dollars to purchase Motorola Mobility? It's been nearly two years since the deal was announced …

Twitter gets a patent on... Twitter
— Although Twitter famously has a pending patent on the familiar “pull-to-refresh” gesture, the company may have just acquired something more valuable: a patent on the Twitter messaging service itself. The new patent issued today with Twitter founders Jack Dorsey …

Zoho Recruit and MailChimp join hands. — Recruiters are actually marketers, and I'm not throwing that term around lightly. They do more than hire candidates. Rather, recruiters research specific industries …